Abstract
The present study supports that short-term (7-days) protocols based on progestagen-impregnated sponges and progesterone-loaded CIDRs are equally effective to induce ovulatory response in sheep. There were no significant differences in the onset of estrus behavior (32.0±6.0 and 33.8±4.0hr after device withdrawal for sponges and CIDRs, respectively; p>0.05) and preovulatory LH discharge (5.1±2.1 and 5.8±3.3hr after onset of estrus behavior for sponges and CIDRs, respectively; p>0.05). These features are similar to previously described for classical long-term (12-14days) treatments. Hence, short-term CIDR-based protocols may be implemented using the same time-intervals for insemination than sponge-based and long-term protocols.
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